ClimateWire: The expansion of the Panama Canal is expected to create new economic opportunities for the United States and the world, but how the canal is used and whether or not it sees competition from emerging Arctic sea routes will also have implications for the climate. In recent weeks, Vice President Joe Biden has been touting the job growth and efficiency gains the $5.25 billion Panama expansion will bring. The project, set for completion in 2015, will double the canal's current capacity by allowing for...